In order for a result to be statistically significant, the test statistic (e.g., z or t value) for a two-tailed test needs to be Sufficiently different than the critical regions As close as 0 as possible Sufficiently different than a critical value Larger than the larger critical value or smaller than the smaller critical value
In order for a result to be statistically significant, the test statistic (e.g., z or t value) for a two-tailed test needs to be
Sufficiently different than the critical regions
As close as 0 as possible
Sufficiently different than a critical value
Larger than the larger critical value or smaller than the smaller critical value
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Which of the following measures is recommended to provide an interpretable measure of spread around the Mean?
Standard Deviation
Variance
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Which of the following is not an element explicitly depicted in a boxplot?
Which of the following is not an element explicitly depicted in a boxplot?
Variance
25th percentile
Interquartile range
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Approximately _____ of data in a
5%
68%
99%
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The sampling distribution of the mean is
The distribution of the means of multiple samples taken from a population
Often used to represent variables for which we don’t know the distribution
The distribution of z-scores from multiple samples
All of the above
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Which measure of
Variance
Mean
SD
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Which of the following is not one of the 7 steps of the research process learned in lecture?
Assign participants to experimental and control conditions
State decision rule
Calculate test statistic
State Alpha
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Why is a z-test usually not useful for researchers?
It assumes a non-normal distribution
It requires knowing the mean and SD of the null population
It requires knowing the mean and SD of the sample
It assumes a normal distribution
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Which of the following is true about statistical significance?
If the null hypothesis is false, then there was statistical significance
Statistical significance is the probability that the null hypothesis is true
We can use p-values to determine statistical significance
Once achieved, it becomes a theory
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Which of the following is an assumption of the one sample Z-test?
Uniform distribution
Independence
Unknown Population SD
All of the above
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A researcher has a sample of one score of 20, which statement is true?
The degrees of freedom for the sample’s distribution is 19
The Standard Deviation of the sample is 1
The total
The mean of the sample is equivalent to the single score of the sample
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The __________ of the test correspond to those values of X that would lead us to reject the null hypothesis.
Critical regions
Statistics
Alternative hypotheses
Outliers
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Which of the following is a directional statistical hypothesis?
The mean Happiness level of NJ residents will be lower than 75, the mean Happiness level of Americans
M > 75
M ≠ 75
M = 75
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